Britney Jean Spears (born December 2, 1981) is a Grammy Award-winning American pop singer, dancer, actress, author and songwriter. She is best known for her studio albums, music videos, and songs such as "...Baby One More Time" and "Oops!...I Did It Again". In the early 2000s, Spears's success as a singer led her way to high-profile advertising deals and endorsements, as well as forays into other forms of media, including film and reality television. Her third and fourth albums, Britney and In the Zone, were released during this era. In 2004, she married back-up dancer and aspiring rap artist Kevin Federline, and the following year she gave birth to their first son, Sean Preston. Their second son, Jayden James, was born in 2006. Spears filed for divorce from Federline on November 7, 2006 citing irreconcilable differences.